/*
 * Copyright 2025 Commonwealth Scientific and Industrial Research
 * Organisation (CSIRO) ABN 41 687 119 230.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import type { AutocompleteChangeReason } from '@mui/material';
import type { QuestionnaireItemAnswerOption } from 'fhir/r4';
import useReadOnly from '../../../hooks/useReadOnly';
import useRenderingExtensions from '../../../hooks/useRenderingExtensions';
import useValidationFeedbackSeverity from '../../../hooks/useValidationFeedbackSeverity';
import type { BaseItemProps } from '../../../interfaces/renderProps.interface';
import { useQuestionnaireStore } from '../../../stores';
import { compareAnswerOptionValue } from '../../../utils/choice';
import { withFallbackDisplay } from '../../../utils/openChoice';
import { createEmptyQrItem, getQRItemId } from '../../../utils/qrItem';
import { FullWidthFormComponentBox } from '../../Box.styles';
import ItemFieldGrid, { getInstructionsId } from '../ItemParts/ItemFieldGrid';
import ItemLabel from '../ItemParts/ItemLabel';
import { sanitizeInput } from '../../../utils/inputSanitization';
import OpenChoiceSelectAnswerOptionField from './OpenChoiceSelectAnswerOptionField';

function OpenChoiceSelectAnswerOptionItem(props: BaseItemProps) {
  const {
    qItem,
    qrItem,
    isRepeated,
    isTabled,
    renderingExtensions,
    parentIsReadOnly,
    feedbackFromParent,
    onQrItemChange,
    calcExpUpdated
  } = props;

  const onFocusLinkId = useQuestionnaireStore.use.onFocusLinkId();

  const readOnly = useReadOnly(qItem, parentIsReadOnly);

  // Perform validation checks
  const { feedback, feedbackSeverity } = useValidationFeedbackSeverity(qItem, feedbackFromParent);
  const { displayInstructions } = useRenderingExtensions(qItem);
  const instructionsId = getInstructionsId(qItem, displayInstructions, !!feedback);

  // Init input value
  const answerKey = getQRItemId(qrItem?.answer?.[0]?.id);
  const answerOptions = qItem.answerOption;
  if (!answerOptions) return null;

  const qrOpenChoice = qrItem ?? createEmptyQrItem(qItem, answerKey);
  const qrAnswer = qrOpenChoice.answer?.[0] ?? null;

  // A coded answer prefers a freshly-resolved display over its own recorded one, falling back
  // to the recorded display only if live resolution can't supply one - same as Choice Select.
  // A free-text answer (no valueCoding) is passed through unchanged; it has no terminology
  // concept and matching it against the coded answerOption list would incorrectly blank it out.
  let valueSelect: QuestionnaireItemAnswerOption | string | null = null;
  if (qrAnswer) {
    if (qrAnswer.valueCoding) {
      const liveValue =
        answerOptions.find((option) => compareAnswerOptionValue(option, qrAnswer)) ?? null;
      valueSelect = liveValue ? withFallbackDisplay(liveValue, qrAnswer.valueCoding) : null;
    } else {
      valueSelect = qrAnswer;
    }
  }

  // Event handlers
  // Handler function which handles both input change and selection change
  function handleValueChange(
    newValue: QuestionnaireItemAnswerOption | string | null,
    reason: AutocompleteChangeReason | string
  ) {
    //if the reason is reset, then we don't change the value, otherwise you will end up with looped setState calls
    if (reason === 'reset') {
      return;
    }
    if (newValue) {
      //If the value is a string (i.e from freeSolo input)
      if (typeof newValue === 'string') {
        onQrItemChange({
          ...qrOpenChoice,
          answer: [{ id: answerKey, valueString: sanitizeInput(newValue) }]
        });
        return;
      }

      //If the value is not a string, then it is a coding.
      const option = newValue;
      if (option['valueCoding']) {
        onQrItemChange({
          ...qrOpenChoice,
          answer: [{ id: answerKey, valueCoding: option.valueCoding }]
        });
      } else if (option['valueString']) {
        onQrItemChange({
          ...qrOpenChoice,
          answer: [{ id: answerKey, valueString: sanitizeInput(option.valueString) }]
        });
      } else if (option['valueInteger']) {
        onQrItemChange({
          ...qrOpenChoice,
          answer: [{ id: answerKey, valueInteger: option.valueInteger }]
        });
      }
      return;
    }
    onQrItemChange(createEmptyQrItem(qItem, answerKey));
  }

  if (isRepeated) {
    return (
      <OpenChoiceSelectAnswerOptionField
        qItem={qItem}
        options={answerOptions}
        valueSelect={valueSelect}
        feedback={feedback}
        feedbackSeverity={feedbackSeverity}
        readOnly={readOnly}
        calcExpUpdated={calcExpUpdated}
        isTabled={isTabled}
        renderingExtensions={renderingExtensions}
        instructionsId={instructionsId}
        onValueChange={handleValueChange}
      />
    );
  }

  return (
    <FullWidthFormComponentBox
      data-test="q-item-open-choice-select-answer-option-box"
      data-linkid={qItem.linkId}
      data-label={qItem.text}
      onClick={() => onFocusLinkId(qItem.linkId)}>
      <ItemFieldGrid
        qItem={qItem}
        readOnly={readOnly}
        labelChildren={<ItemLabel qItem={qItem} readOnly={readOnly} />}
        fieldChildren={
          <OpenChoiceSelectAnswerOptionField
            qItem={qItem}
            options={answerOptions}
            valueSelect={valueSelect}
            feedback={feedback}
            feedbackSeverity={feedbackSeverity}
            readOnly={readOnly}
            calcExpUpdated={calcExpUpdated}
            isTabled={isTabled}
            renderingExtensions={renderingExtensions}
            instructionsId={instructionsId}
            onValueChange={handleValueChange}
          />
        }
      />
    </FullWidthFormComponentBox>
  );
}

export default OpenChoiceSelectAnswerOptionItem;